Quantitative Determination of Spring Water Quality Parameters via Electronic Tongue.

Autor: Carbó, Noèlia, López Carrero, Javier, Garcia-Castillo, F. Javier, Tormos, Isabel, Olivas, Estela, Folch, Elisa, Alcañiz Fillol, Miguel, Soto, Juan, Martínez-Máñez, Ramón, Martínez-Bisbal, M. Carmen
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Zdroj: Sensors (14248220); Jan2018, Vol. 18 Issue 1, p40, 12p
Abstrakt: The use of a voltammetric electronic tongue for the quantitative analysis of quality parameters in spring water is proposed here. The electronic voltammetric tongue consisted of a set of four noble electrodes (iridium, rhodium, platinum, and gold) housed inside a stainless steel cylinder. These noble metals have a high durability and are not demanding for maintenance, features required for the development of future automated equipment. A pulse voltammetry study was conducted in 83 spring water samples to determine concentrations of nitrate (range: 6.9-115 mg/L), sulfate (32-472 mg/L), fluoride (0.08-0.26 mg/L), chloride (17-190 mg/L), and sodium (11-94 mg/L) as well as pH (7.3-7.8). These parameters were also determined by routine analytical methods in spring water samples. A partial least squares (PLS) analysis was run to obtain a model to predict these parameter. Orthogonal signal correction (OSC) was applied in the preprocessing step. Calibration (67%) and validation (33%) sets were selected randomly. The electronic tongue showed good predictive power to determine the concentrations of nitrate, sulfate, chloride, and sodium as well as pH and displayed a lower R2 and slope in the validation set for fluoride. Nitrate and fluoride concentrations were estimated with errors lower than 15%, whereas chloride, sulfate, and sodium concentrations as well as pH were estimated with errors below 10%. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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